PHYS 1202 EXAM 1 UPDATED QUESTIONS AND CORRECT ANSWERS

PHYS 1202 EXAM 1 UPDATED QUESTIONS AND
CORRECT ANSWERS

Question:
1. electron is/is not an elementary particle
Answer:
is

Question:
2. proton and neutron are composed of
Answer:
quarks

Question:
3. quarks experience these four fundamental interactions
Answer:
electromagnetism, gravitation, strong interaction, weak interaction

Question:
4. SI unit of charge
Answer:
Coulomb (C)

Question:
5. the force between objects with the same sign for the charge is
Answer:
repulsive

Question:
6. the force between objects with different signs for the electric charge is
Answer:
attractive

Question:
7. the gravitational PE is ___ because the force is always ___
Answer:
negative, attractive

Question:
8. the electrostatic PE can be ___ because of the ___ force
Answer:
postive, repulsive

Question:
9. angular momentum of an electron is a vector in a direction ___ to its plane of rotation

, Answer:
perpendicular

Question:
10. a negative total energy indicates that
Answer:
electron is bound to the proton

Question:
11. E total is the energy required to remove an electron from
Answer:
ground state of hydrogen atom

Question:
12. Newton's law is always
Answer:
attractive

Question:
13. Coulomb's law is attractive (-) when
Answer:
charges have opposite signs

Question:
14. Coulomb's law is repulsive (+) when
Answer:
charges have same signs

Question:
15. An electrically neutral hard rubber rod is rubbed with electrically neutral animal fur. The rod acquires a
net ___ charge and the fur sustains a net ___ charge. They both experience a ___ charge. The charge is
Answer:
negative, positive, attractive, conserved

Question:
16. electrically neutral rods may have
Answer:
separate regions of positive and negative charge

Question:
17. materials through which charge can move easily (copper). Valence electrons not tightly bound to atom
Answer:
conductors

Question:
18. materials through which charge does not move freely (rubber, plastic, pure water). Charge more tightly
bound to atom